Influence of Methylprednisolone Pulse Therapy on Liver Function in Patients with Graves’ Orbitopathy

Miśkiewicz, Piotr; Jankowska, Anna; Brodzińska, Kinga; Milczarek-Banach, Justyna; Ambroziak, Urszula

doi:https://doi.org/10.1155/2018/1978590

International Journal of Endocrinology

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Abstract Introduction Methods Results Discussion Limitations Conclusion Data Availability Disclosure Conflicts of Interest Authors’ Contributions Acknowledgments References Copyright Related Articles

Clinical Study | Open Access

Volume 2018 | Article ID 1978590 | https://doi.org/10.1155/2018/1978590

Influence of Methylprednisolone Pulse Therapy on Liver Function in Patients with Graves’ Orbitopathy

Piotr Miśkiewicz,¹Anna Jankowska,¹Kinga Brodzińska,¹Justyna Milczarek-Banach,¹and Urszula Ambroziak¹

Academic Editor: Silvia Monticone

Received05 Apr 2018

Revised22 Aug 2018

Accepted03 Sept 2018

Published21 Oct 2018

Abstract

Purpose. Intravenous methylprednisolone (IVMP) pulse therapy is the first-line treatment in active moderate-to-severe Graves’ orbitopathy (GO) and dysthyroid optic neuropathy (DON). One of the adverse effects of this therapy is liver dysfunction that can be mild (ALT < 100 U/L), moderate (ALT: 100–300 U/L), and severe defined as acute liver injury (ALI) (ALT > 300 U/L). ALI can be irreversible and fatal. The aim of the study was to evaluate the influence of two different schemes of therapy with IVMP in moderate-to-severe GO and DON on biochemical liver parameters. Materials and Methods. 49 patients with moderate-to-severe GO were treated with IVMP in every week schedule (cumulative dose 4.5 g), and 19 patients with DON received 3.0 g IVMP (1.0 g/day for 3 consecutive days). AST, ALT, and total bilirubin were measured before treatment and after IVMP in the following selected pulses: after 0.5 g (A1), 3.0 g (A2), and 4.5 g (A3) in the group with moderate-to-severe GO and after 3.0 g IVMP in the group with DON (B1). Results. We observed a statistically higher level of AST and ALT after therapy with 3.0 g of IVMP (B1) than after 0.5 g (A1), 3.0 g (A2), and 4.5 g of IVMP (A3). Mild elevation of ALT was found in 4% and 11% of patients with moderate-to-severe GO and DON, respectively. Moderate elevation of ALT was found in 0% and 21% of patients with moderate-to-severe GO and DON, respectively. There were no cases of ALI. Conclusion. Therapy of GO with higher doses (1.0 g) of IVMP in consecutive days is associated with higher risk of liver damage than treatment with moderate doses (≤0.5 g) in every week schedule. This trial is registered with NCT03667157.

1. Introduction

Graves’ orbitopathy (GO) is a disorder characterized by orbital soft tissue inflammation and oedema associated with glycosaminoglycan deposition and fibrosis [1]. The most frequent cause is Graves’ disease, but it can also occur in Hashimoto’s thyroiditis [2]. The classification is comprised based on the severity of orbital changes ranging from mild GO, moderate-to-severe GO, to sight-threatening GO, which includes dysthyroid optic neuropathy (DON) [3]. Untreated GO can result in the significant impairment of quality of life (QoL) [4]. Intravenous methylprednisolone (IVMP) pulse therapy is the first-line treatment in the active-phase of moderate-to-severe GO and DON [3]. This therapy is more effective and better tolerated than oral glucocorticoids (GCs) [5–12]. The current recommendation of the European Group of Graves’ Orbitopathy (EUGOGO) is that cumulative doses of intravenous GCs should not exceed 8.0 g in each treatment course, and pulses should not be given on consecutive or alternate days, except in the case of DON [3]. This limitation is due to the necessity of the prevention of severe side effects that are rare but may be fatal. One of the most severe adverse events is acute liver injury (ALI), in some cases irreversible and/or fatal [12–14]. In four independent studies, the estimated morbidity and mortality of ALI was found to be 1–4% and 0.01–0.3%, respectively [15–18]. Since 2000, there were 5 reported fatal cases [16, 17, 19]. This study was performed to evaluate the influence of different schemes of therapy with IVMP in patients with moderate-to-severe GO and DON on biochemical liver parameters.

2. Material and Methods

2.1. Patients

We enrolled 68 patients (46 women and 22 men) to the study. Patients were admitted to the Department of Endocrinology at the Medical University of Warsaw for IVMP pulse therapy between 2012 and 2016. The inclusion criteria consisted of active, moderate-to-severe GO or DON; age ≥ 18 years; euthyroidism for at least 1 month (patients with hyperthyroidism treated with antithyroid drugs, after radiotherapy/surgical treatment on levothyroxin therapy if necessary, with euthyroid GO, or with Hashimoto’s disease on levothyroxin therapy); and completion of 12 pulses in patients with moderate-to-severe GO and 3.0 g cycles of pulses in patients with DON. The exclusion criteria were alanine aminotransferase (ALT) and/or aspartate aminotransferase (AST) >2x upper limit of normal; active viral hepatitis; abdominal ultrasound examination indicating chronic changes in liver structure, including cirrhosis; present or past medical history of autoimmune hepatitis; previous GCs therapy within the last 6 months; alcohol abuse; active inflammation; and active neoplastic disease.

Depending on the severity according to EUGOGO recommendations, patients were divided into the following two groups: the first group with active, moderate-to-severe GO (49 patients) and the second group with DON (19 patients). Moderate-to-severe GO was diagnosed according to EUGOGO recommendations [3]. Diagnosis of DON in patients with GO was based on at least two signs, including (i) deterioration of VA (<1.0), (ii) loss of colour vision (more than two errors in Ishihara plates), (iii) optic disc swelling, and/or (iv) signs of DON in a magnetic resonance (MR) scan (presence of apical crowding and/or optic nerve stretching). Group characteristics are described in Table 1.

2.2. Study Design and Outcome Analysis

Laboratory tests were performed before treatment in all patients from both evaluated groups. Serum markers of exposure to HBV and HCV were checked: hepatitis B surface antigen (HBs-Ag), hepatitis B surface antibody (HBs-Ab), hepatitis B core antibody (HBc-Ab), and hepatitis C antibody (HCV-Ab). Serum autoantibodies associated with autoimmune hepatitis including anti-nuclear antibodies (ANA1), anti-smooth muscle antibodies (ASMA), anti-mitochondrial antibodies (AMA), and anti-liver kidney-microsomal antibodies (anti-LKM) were also assessed. Thyroid evaluation included measurement of: thyroid-stimulating hormone (TSH), free triiodothyronine (fT3), free thyroxine (fT4), and serum antithyroid autoantibodies including anti-thyroid peroxidase (aTPO), thyroglobulin antibodies (aTG), thyroid-binding inhibitory immunoglobulin (TBII).

According to EUGOGO recommendations patients with moderate-to-severe GO were treated with IVMP cumulative dose 4.5 g during a 12-week period [3]. For the first 6 weeks 0.5 g IVMP per week was administrated and for the next 6 weeks 0.25 g IVMP per week. For the next 3 months patients received oral prednisone at a gradually reduced daily morning dose from 30 mg/day to 5 mg/day. Patients with DON received 3.0 g IVMP (1.0 g/day for 3 consecutive days) as the basic treatment [3]. Further treatment was established individually (endoscopic intranasal orbital decompression of medial wall, additional high doses of IVMP pulse therapy (3.0 g), additional orbital decompression (lateral, inferior or medial wall), 12 pulses with IVMP (additional cumulative dose 4.5 g)), but our statistical analysis included only an evaluation of the basic schedule. The effectiveness of such DON treatment was described in previous study by Miśkiewicz et al. [20]. Schemes of treatment and points of laboratory evaluation in both groups are presented in Figure 1.

Figure 1

Treatment scheme. A0—patients with moderate-to-severe GO before treatment; A1—after administration of 0.5 g intravenous methylprednisolone (IVMP); A2—after administration of 3.0 g IVMP; A3—after administration of 4.5 g IVMP; B0—patients with DON before treatment; B1—after administration of 3.0 g IVMP; TSH—thyroid-stimulating hormone; fT3—free triiodothyronine; fT4—free thyroxine; aTPO—anti-thyroid peroxidase; aTG—thyroglobulin antibodies; TBII—thyroid-binding inhibitory immunoglobulin; AST—aspartate aminotransferase; ALT—alanine aminotransferase; HBs-Ag—hepatitis B surface antigen; HBs-Ab—hepatitis B surface antibody; HBc-Ab—hepatitis B core antibody; HCV-Ab—hepatitis C antibody; ANA—anti-nuclear antibodies; ASMA—anti-smooth muscle antibodies; AMA—anti-mitochondrial antibodies; anti-LKM—anti-liver kidney-microsomal antibodies; GO—Graves’ orbitopathy; DON—dysthyroid optic neuropathy.

Liver function parameters for further analysis including AST, ALT and total bilirubin were measured: the day before treatment (A0 in moderate-to-severe GO, B0 in DON) and the day after administration of IVMP in selected pulses: after 0.5 g (1st pulse—A1), after 3.0 g (6th pulse—A2) and after 4.5 g (12th pulse—A3) in the group with moderate-to-severe GO; after 3.0 g IVMP in the group with DON (B1). The comparison between groups, based on biochemical parameters, was performed in 3 stages: (i) A1 (0.5 g) vs. B1 (3.0 g), (ii) A2 (3.0 g) vs. B1 (3.0 g), and A3 (4.5 g) vs. B1 (3.0 g).

Depending on concentrations of ALT, liver dysfunction was divided into mild (above the upper limit of normal but less than 100 U/L), moderate (100–300 U/L), and severe (>300 U/L). ALI was defined as an ALT concentration > 300 U/L. However, we also evaluated a 4-fold increase of ALT in comparison to the initial values.

Routine laboratory tests and clinical evaluation were performed before every single pulse. Laboratory tests consisted of ALT, AST, CRP, and urine analysis. In cases of moderate and severe increases in ALT (more than 100 U/L), therapy was stopped. In patients with DON and increased ALT (more than 100 U/L) after 3.0 g IVMP, we did not repeat another cycle of 3.0 g IVMP. However, if ALI did not occur (ALT < 300 U/L) and the level of ALT/AST normalized, we administered 12 pulses of IVMP in every week schedule (additional cumulative dose 4.5 g) in these patients with an active phase of GO.

Follow-up was performed in all of the patients and it included evaluation of AST, ALT, and total bilirubin between 1 and 3 months after completion of IVMP therapy.

The study was approved by the Bioethics Committee of the Medical University of Warsaw.

2.3. Laboratory Measurements

Venous blood was collected in the morning following a 12-hour fast. TSH, fT3, fT4, aTPO, aTG, TBII, HBs-Ag, HBs-Ab, HBc-Ab, and HCV-Ab were measured in serum using an electrochemiluminescence immunoassay (cobas 8000 System, Roche Diagnostics, Switzerland). Concentrations of AST and ALT were measured by the standard reaction of NADH oxidation, total bilirubin by calorimetric method (cobas 8000 System, Roche Diagnostics, Switzerland). The level of serum autoantibodies (ANA1, ASMA, AMA, and anti-LKM) was measured using an indirect immunofluorescence method (EUROIMMUN tests, Sprinter XL Analyzer, EUROIMMUN, Germany).

All methods were calibrated and controlled according to manufacturers’ recommendations. Laboratory normal ranges are presented in Table 1.

2.4. Ultrasound

Liver ultrasound examination was performed in every patient before IVMP therapy.

2.5. Statistics

Statistical analysis was performed using STATISTICA software ver. 12.0. Continuous variables were demonstrated as mean ± standard deviation (SD) or median values. Categorical data were presented as numbers () or percentages (%). Changes between liver function parameters in selected time points of the study were compared using the Mann–Whitney U test and Fisher’s 2 × 2 exact test. The statistical significance was established at <0.05 level. After Bonferroni’s correction for the six main tested hypotheses, results with a value < 0.0083 were considered significant.

3. Results

3.1. Evaluation before Intervention

In 2 patients from the group with moderate-to-severe GO with a past medical history of viral hepatitis B, mild increases in ALT were observed before therapy, which later normalized during IVMP treatment. In 2 patients with DON and a past medical history of viral hepatitis B, the level of aminotransferases was within the normal range before and during therapy. In all of these patients, active viral infection was excluded. In one patient with moderate-to-severe GO and a history of HAV infection, serum aminotransferase concentrations were within the normal range during the entire treatment. Two patients with moderate-to-severe GO were suspected of Gilbert’s syndrome. Laboratory measurements indicated an increased total bilirubin value during the entire IVMP therapy, while AST and ALT concentrations were within the normal limits. Mean ALT, AST, and total bilirubin levels were comparable between groups with moderate-to-severe GO (A0) and DON (B0) (Table 1). Serum autoantibodies associated with autoimmune hepatitis (ANA1, ASMA, AMA, and anti-LKM) were negative in all patients before treatment. One patient in the DON group had diabetes type 2 treated with metformin. Glucose control was good in this patient, and HbA1C was normal. In 18 patients (13 with GO and 5 with DON), the ultrasound revealed liver steatosis. Only in one patient with liver steatosis and moderate-to-severe GO the level of ALT was mildly increased before treatment (68 U/L). This aminotransferase normalized during the IVMP treatment.

3.2. Evaluation after IVMP Treatment

Analysed data are presented in Figure 2 and Tables 2 and 3. We observed a statistically higher level of AST and ALT after therapy with 3.0 g of IVMP (B1) in DON than in patients with moderate-to-severe GO after 0.5 g (A1), 3.0 g (A2), and 4.5 g (A3) of IVMP. Total bilirubin median values were similar in both groups of patients after therapy.

Figure 2

Comparison of the influence of different models of intravenous methylprednisolone IVMP therapy on ALT—median values and statistical significance using Mann–Whitney U test ( values after Bonferroni correction are significant if <0.0083). A0—before treatment; A1—after administration of 0.5 g IVMP; A2—after administration of 3.0 g IVMP; A3—after administration of 4.5 g IVMP; B0—before treatment; B1—after administration of 3.0 g IVMP; ALT—alanine aminotransferase (normal range: 7–56 U/L).

In patients with moderate-to-severe GO, a mild elevation of ALT was observed in 0 (0%), 2 (4%), and 0 (0%) patients in A1, A2, and A3 points of evaluation, respectively. There were no patients with moderate and severe increases of aminotransferases in this group.

In patients with DON in point B1, mild elevation of ALT was observed in 2 patients (11%) and moderate in 4 patients (21%). Severe increases of aminotransferases were not observed. The risk of moderate elevation of ALT in the DON group was higher than in moderate-to-severe GO (). A 4-fold increase of ALT was observed after therapy in 4 patients with DON (21%) and in none of the patients with moderate-to-severe GO at all points of evaluation (A1, A2, and A3). These differences between both groups were statistically significant (). Biochemical parameters did not progress to complete ALI and frankly normalized during follow-up. All patients with DON with increased ALT and/or AST were treated with additional 12 pulses of IVMP in every week schedule (additional cumulative dose 4.5 g) after previous normalization of aminotransferase levels. The levels of ALT and AST were in the normal range during this part of treatment (Table 3). We did not notice an increase of ALT after this therapy. Additionally, we did not observe moderate or severe increases of ALT and/or AST before routine pulses between the main points of evaluation (in both groups of patients).

Before and during IVMP therapy, 18 patients were treated with statins (11 patients with moderate-to-severe GO and 7 patients with DON). All of the patients had aminotransferases in the normal range before treatment. In 13 of the patients, aminotransferases were in the normal range during the entire IVMP therapy. In 4 patients after IVMP administration, there was a mild increase of ALT or AST observed (three patients with DON and one patient with moderate-to-severe GO). In one patient with DON, we found a moderate (>100 U/L), 4-fold increase of ALT.

There was no difference between the age of patients with DON with vs. without an increased level of ALT concentration 61.4 vs. 64.5 years ().

4. Discussion

IVMP pulse therapy is used as the first-line treatment in active moderate-to-severe and very severe GO [3]. It decreases inflammation and clinical symptoms and significantly improves the quality of life [4]. However, it is also associated with several side effects. One of these is hepatotoxicity, often manifested as an asymptomatic increase in serum liver enzymes. However, several cases of ALI due to IVMP have been reported, some of which were fatal [15–19, 21–26]. The morbidity and mortality of ALI were declared by several authors to range from 0.8% to 4.0% and from 0.09% to 0.3%, respectively (Table 4) [14–18, 27].

This is the first study to compare the influence on biochemical liver parameters of two treatment schedules with IVMP without oral CCs in the same evaluation. We observed that after 3.0 g IVMP given in three consecutive days (3 × 1.0 g), the increase of ALT was higher in comparison to therapy on a weekly schedule: 0.5 g (one pulse), 3.0 g (6 × 0.5 g), and 4.5 g (6 × 0.5 g plus 6 × 0.25 g). This indicates that higher single doses of IVMP (1.0 g) given on consecutive days are associated with a higher risk of hepatotoxicity than weekly pulses with medium or lower doses (≤0.5 g), even when the cumulative dose is lower (3.0 g vs. 4.5 g). To our knowledge, only one study, performed by Le Moli et al., compared the safety and efficacy of GCs therapy patients with active, moderate-to-severe GO and DON according to hepatotoxicity [28]. The group with moderate-to-severe GO () was treated according to the same protocol as in our study (cumulative dose 4.5 g). Patients with DON () received two 3.0 g cycles of pulses repeated in the second week followed by oral prednisolone (cumulative dose 8.45 g). Authors evaluated an increase of ALT above the upper limit (40 U/L) during therapy and follow-up and noticed it significantly more often in the DON group than in the GO group. No cases of severe ALI were observed. They concluded that mild elevation in liver enzymes is dose dependent. It is worth underlining that in the Le Moli study, comparison of the effect of total GCs between the two groups included prednisolone therapy and a follow-up period.

Liver damage is defined as an increased level of ALT. This parameter is approved to be more specific for hepatocytes than AST, leading some authors to establish ALT concentration as a criterion of division of liver dysfunction into mild (<100 U/L), moderate (100–300 U/L), and severe (>300 U/L). ALI is defined as ALT concentration > 300 U/L [15, 26]. Some authors consider a 4-fold increase in ALT as an additional criterion of hepatotoxicity [14]. None of our 68 patients was observed to have severe or fatal ALI. However, a 4-fold increase of ALT, which is considered in some studies as ALI criterion, was observed in 21% of patients with DON after IVMP therapy and in none of the patients with moderate-to-severe GO (). Biochemical parameters did not progress to complete ALI and normalized during follow-up. Some of the patients with DON after the first treatment cycle (1.0 g/day for 3 consecutive days) received 12 additional pulses of IVMP in every week schedule (cumulative dose 4.5 g). What is interesting is that even if they have increased ALT and/or AST after the first cycle, we did not observe again an increase of aminotransferases during treatment in the second cycle with lower doses of IVMP (second cycle was started after normalisation of aminotransferases). According to Sisti et al.’s retrospective studies, the risk of ALI morbidity accounts for about 1% [15, 16]. Significant correlation with ALI was confirmed for age and methylprednisolone cumulative dose, which were both greater in patients with ALI [16]. In our study, we did not find a difference in age between patients with DON with vs. without an increased level of ALT concentration. However, patients in the DON group were older than in the group with moderate-to-severe GO and values of biochemical parameters over the upper normal limit did occur at various ages (Tables 1–3).

Mechanisms causing an IVMP-induced toxic effect on hepatocytes remain incompletely elucidated. There are some possible hypotheses that may explain the occurrence of ALI. Firstly, GCs can lead to the reactivation of autoimmune hepatitis [12, 19, 21, 22]. Moleti et al. suggest two types of immune reaction—an immune “rebound phenomenon” following GCs withdrawal, which may trigger autoimmune hepatitis in those predisposed, and an immune-allergic or metabolic idiosyncratic reaction toward GCs [24, 26, 29]. In our study, serum autoantibodies associated with autoimmune hepatitis (ANA1, ASMA, AMA, and anti-LKM) were assessed in all patients before treatment and were negative. The second mechanism of ALI is the reactivation of viral hepatitis [17, 30, 31]. Marino et al. [17] and Le Moli et al. [28] pointed out that the presence of viral hepatitis markers might increase the relative risk of liver damage, and ALT concentration > 40 U/L is significantly associated with liver injury in such patients. However, Wichary and Gasińska concluded that relatively high doses of IVMP in patients with a past history of HBV infection were not a risk factor for the reactivation of HBV [30]. We excluded active hepatitis in all patients before therapy. No cases of reactivation of viral hepatitis after IVMP administration were observed. Finally, there is a well-known direct toxic effect of GCs on hepatocytes, probably dose dependent [28, 30, 32, 33]. Normalization in follow-up of previously increased levels of ALT after very high doses IVMP (3.0 g), without further increase after the next 12 weekly pulses, indicate a direct toxic and dose-dependent effect of IVMP that was transient and did not lead to ALI.

High doses and long-term use of GCs are associated with the development or exacerbation of nonalcoholic steatohepatitis [34]. Ultrasound evaluation performed before treatment with GCs revealed steatosis in 18 patients, and only in one patient with moderate-to-severe GO was the level of ALT mildly increased and normalised during IVMP treatment.

In our opinion, patients with DON and increased ALT (especially >100 U/L and/or more than 4-fold) after the first cycle with very high doses of IVMP (1.0 g/day for 3 consecutive days) should be treated in the second step of therapy with decompression. Further therapy with 12 weekly pulses of IVMP in these patients with active GO can be considered, after aminotransferase normalization, without a history of ALI and the presence of viral hepatitis.

5. Limitations

One limitation of this study was the relatively small number of patients. Five patients with an increase of aminotransferases were taking statins (4 with DON and 1 with moderate-to-severe GO). Sabini et al. found no correlation between using statins and occurrence of ALI in patients taking high doses of intravenous GCs [35], but we cannot exclude such influence as an additional risk factor.

6. Conclusion

The therapy of GO with higher doses (1.0 g) of IVMP on consecutive days is associated with a higher risk of liver damage than treatment with moderate doses (≤0.5 g) on a weekly schedule. This study supports EUGOGO’s statement that the only indication for such therapy should be DON. Careful examination should be performed before initial therapy with IVMP including liver function parameters (ALT, AST, and total bilirubin), autoantibodies associated with autoimmune hepatitis, and exclusion of active hepatitis. Monitoring of ALT and AST should be performed before every pulse of IVMP because acute liver injury can be asymptomatic, and even mild or moderate elevations of biochemical parameters can progress to complete ALI.

Data Availability

The data (laboratory measurements) used to support the findings of this study are available from the corresponding author upon request.

Disclosure

The research was performed during the authors’ employment at the Department of Endocrinology at the Medical University of Warsaw.

Conflicts of Interest

The authors declare no conflict of interest.

Authors’ Contributions

Piotr Miśkiewicz was responsible for the concept and design of the study and team coordination. Piotr Miśkiewicz and Justyna Milczarek-Banach collected patient data. Anna Jankowska and Kinga Brodzińska prepared clinical data for analysis. Piotr Miśkiewicz, Anna Jankowska, Kinga Brodzińska, and Urszula Ambroziak analyzed clinical data. Piotr Miśkiewicz, Anna Jankowska, and Kinga Brodzińska were responsible for statistical analysis. Piotr Miśkiewicz, Anna Jankowska, and Kinga Brodzińska contributed to the preparation of the tables and figures. Anna Jankowska, Kinga Brodzińska, Piotr Miśkiewicz, and Urszula Ambroziak drafted the manuscript. Piotr Miśkiewicz prepared the final manuscript version. All authors edited and approved the final version of the manuscript.

Acknowledgments

The authors would like to express special thanks to Dr. Suzy Żurecka who took a part in final proofreading.

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Copyright © 2018 Piotr Miśkiewicz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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